18 



MASS. EXPERIMENT STATION BULLETIN 353 



retain the spray. The value of this method is demonstrated annually in commer- 

 cial apple orchards where the pest is so well controlled by the pre-blossom sprays 

 that growers feel little or no concern about this species in their orchards. 



Bourne, A. I., and Shaw, F. R. Mass. Ext. Leaflet 167. 

 Biitton, W. E. Conn. Agr. Exp. Sta. Bui. 378. 1935. 



1937. 



Eastern Tent Caterpillar. 



Left, egg mass; right, mature caterpillars. Courtesy, Conn. Agr. Expt. Station. 



Forest Tent Caterpillar 



Malacosoma disstriu Hbn. 

 The forest tent caterpillar is closely related to the eastern tent caterpillar and is 

 often mistaken for it. Unlike the latter species, however, this insect makes no 

 nest and the caterpillars feed independently most of their lives. When nearly 

 mature they congregate on the trunks of trees in somewhat the same way that the 

 eastern tent caterpillars cluster on the outside of their nest. The forest tent 

 caterpillar is blue in appearance with a row of keyhole-shaped white spots on its 

 back instead of a white stripe. The moth is slightly paler and has dark instead 

 of white oblique stripes on its front wings. The ends of its egg clusters are squared 



Forest Tent Caterpillar. 



Left, egg mass; right, mature caterpillars. Courtesy, Conn. Agr. Expt. Station. 



